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Well I can start you off with a little info. First off it sounds like you may have a few problems, but hopefully all minor and manageable. There are two different temperature sensors in the engine block. The "temp sender" just connects to the gauge in the cluster. If it fails, it will not throw a check engine light because its function does not effect the running of the motor you would just notice incorrect temp gauge readings. The "coolant temp sensor" or CTS sends its signal to the LH fuel injection computer. If this fails, it WILL set the check engine light and with a missing temp signal the computer will default to an average temp setting resulting in the engine not running at peak performance.
Seeing as how the check engine light is on, you should check the OBD diagnostic codes to get a better idea of what the problem is. I'm not really sure why either of the temp sensors I mentioned would be replaced with A/C work, but I recently replaced my CTS and a few days later got an OBD code for a failed CTS. When I checked it again, I found a fault in the plug itself, an easy splice in fix wit a fuel injector connector.
Finally, is the car really overheating or is the temp gauge just going into the red? If it is in the red, but you put your hand on the hood and it is cool to the touch, then this is a sign of a faulty gauge/sender over a thermostat/cooling system problem.
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